Pressure fluctuations in a gas-solid fluidized bed with a screen

1986 ◽  
Vol 25 (1) ◽  
pp. 284-289 ◽  
Author(s):  
Y. W. Huang ◽  
L. T. Fan ◽  
J. C. Song ◽  
N. Yutani
Keyword(s):  
Fluidized Bed ◽  
Pressure Fluctuations

Characteristics of Pressure Fluctuations in a Fluidized Bed of Binary Mixtures

2005 ◽  
Vol 38 (12) ◽  
pp. 960-968 ◽  
Author(s):  
Zhanyong Li ◽  
Noriyuki Kobayashi ◽  
Masanobu Hasatani
Keyword(s):  
Fluidized Bed ◽  
Binary Mixtures ◽  
Pressure Fluctuations

Identification of the State of a Magneto-Fluidized Bed by Pressure Fluctuations

2006 ◽  
Vol 4 (1) ◽  
Author(s):  
Sachin Dahikar ◽  
Ram Sonolikar
Keyword(s):  
Fluidized Bed ◽  
Autocorrelation Function ◽  
Pressure Fluctuations ◽  
Spectral Density Function ◽  
Functional Relationships ◽  
Power Spectral ◽  
Data Points ◽  
Instantaneous Pressure ◽  
Conventional Signal ◽  
Mutual Information Function

Local instantaneous pressure signals obtained through a magneto-fluidized bed have been analyzed using both classical and advanced signal analysis methods, which can deliver the necessary information about the presence of the bubbling and turbulent flow pattern. The conventional signal processing tool such as autocorrelation and cross correlation were used as preliminary tools to analyze the data. Evaluation of the dominant bubble frequency was completed using the autocorrelation function and power spectral density function. Mutual information function was used to identify the periodicity and the predictability of the local instantaneous pressure signals. Since it does not demand any particular functional relationships between the data points, it is a better method (compared to autocorrelation function) for measuring the predictability of nonlinear systems.

Characterization of pressure fluctuations from a gas–solid fluidized bed by structure density function analysis

2015 ◽  
Vol 129 ◽  
pp. 156-167 ◽  
Author(s):  
Yumin Chen ◽  
C. Jim Lim ◽  
John R. Grace ◽  
Junying Zhang ◽  
Yongchun Zhao ◽  
...  
Keyword(s):  
Density Function ◽  
Fluidized Bed ◽  
Function Analysis ◽  
Pressure Fluctuations ◽  
Structure Density

Detection of gas-solid flow faults of a circulating fluidized bed using pressure fluctuations in wind caps

2016 ◽  
Vol 33 (7) ◽  
pp. 2240-2251 ◽  
Author(s):  
Hua-wei Jiang ◽  
Jian-qiang Gao ◽  
Hong-wei Che ◽  
Jun-fu Lu ◽  
Fu-mao Wang ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Pressure Fluctuations ◽  
Solid Flow

Multiresolution analysis of pressure fluctuations in a gas–solids fluidized bed: Application to glass beads and polyethylene powder systems

2007 ◽  
Vol 131 (1-3) ◽  
pp. 23-33 ◽  
Author(s):  
Bangyou Wu ◽  
Apostolos Kantzas ◽  
Céline T. Bellehumeur ◽  
Zhengxing He ◽  
Sergey Kryuchkov
Keyword(s):  
Fluidized Bed ◽  
Multiresolution Analysis ◽  
Pressure Fluctuations ◽  
Glass Beads ◽  
Polyethylene Powder

Horizontal Pressure Fluctuation in Bubbling Fluidized Bed

2003 ◽  
Author(s):  
Vesa V. Walle´n
Keyword(s):  
Pressure Gradient ◽  
Fluidized Bed ◽  
Pressure Fluctuation ◽  
Pressure Fluctuations ◽  
Middle Part ◽  
Biomass Combustion ◽  
Bottom Part ◽  
Pressure Transducers ◽  
Bubbling Fluidized Bed ◽  
Horizontal Pressure

Pressure measurements were conducted in a two-dimensional hot atmospheric bubbling fluidized bed reactor in the laboratory of Energy and Process Engineering at Tampere University of Technology. A set of six fast pressure transducers was used to detect the rapid pressure fluctuations inside the bubbling bed of the reactor. These pressure transducers were placed both vertically and horizontally into the reactor. From these measurements it was found that the vertical pressure fluctuation took place at the same time at different levels of the bed. Also the same fluctuation could be seen under the air distributor. The horizontal pressure fluctuation was found to vary both by place and time. At the bottom part of the bed the highest pressure peaks was found at centre of the bed. Most of the time there was a pressure gradient the highest pressure being in the centre of the bed. This gradient creates horizontal flow of gases from middle to the sides. The velocity of this flow varies with the size of the pressure gradient. The opposite effect can be found in the upper part of the bed. The highest pressure was no more in the middle part of the bed. Instead, it was found to be between the centre of the bed and left and right walls. The pressure was low at the walls but also rather low at the middle of the bed. There must be flow towards the walls and to the centre axis. These pressure fluctuations can provide an explanation for the well-known “wandering plume” effect. They can also give a tool to better describe the mixing inside a bubbling fluidized bed. This kind of tool is needed when biomass combustion is modelled in bubbling fluidized bed.

Properties of pressure fluctuations in a gas—solids fluidized bed under a free bubbling condition

1986 ◽  
Vol 45 (3) ◽  
pp. 245-265 ◽  
Author(s):  
S. Hiraoka ◽  
K.C. Kim ◽  
S.H. Shin ◽  
L.T. Fan
Keyword(s):  
Fluidized Bed ◽  
Pressure Fluctuations
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